Data commit

Task/Checkpoint-synchronization/D/checkpoint-synchronization.d

@@ -0,0 +1,24 @@
+import std.stdio;
+import std.parallelism: taskPool, defaultPoolThreads, totalCPUs;
+
+void buildMechanism(uint nparts) {
+    auto details = new uint[nparts];
+    foreach (i, ref detail; taskPool.parallel(details)) {
+        writeln("Build detail ", i);
+        detail = i;
+    }
+
+    // This could be written more concisely via std.parallelism.reduce,
+    // but we want to see the checkpoint explicitly.
+    writeln("Checkpoint reached. Assemble details ...");
+    uint sum = 0;
+    foreach (immutable detail; details)
+        sum += detail;
+    writeln("Mechanism with ", nparts, " parts finished: ", sum);
+}
+
+void main() {
+    defaultPoolThreads = totalCPUs + 1; // totalCPUs - 1 on default.
+    buildMechanism(42);
+    buildMechanism(11);
+}